A swing to dangle you off the very edge.

An abandoned Jazz Age dream home and con man's hideout in Death Valley.

The rocks in this arid basin leave trails of movement behind them.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

Towering basalt columns, a creation of fire and ice.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

A beautiful geyser under environmental threat.

One man's ambition created this psychedelic log home.

Native Americans built this circle of stones, which was used to predict astronomical events.

The largest earthwork effigy in the world.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Houses are tucked between, on, and underneath giant boulders.